Atrial fibrillation is a collective name that combines various types of heart rhythm and hemodynamic disorders, one of which is the paroxysmal form.\n\nWhen determining the sinus pacemaker (electrical activity of the heart), the activity of the sinus node can change in a certain mode, which allows for correct assessment heart rhythm.\n\nA. fibrillatoria constantis is defined as a persistent chaotic rhythmic pattern of a sinus or ectopic pacemaker, usually characterized by QRS rhythm compensation with reverse periodicity (with a duration of the latter > 60%) and/or a shortened PQ interval. Typically, the QRS reaches its q value in the vertical ventricle: about 0.12 seconds (EGC study).\n\nThe paroxysmal form of atrial fibrillation (chaotic rhythm) is preceded by altered results of the propriocorticotropinectomy test.\n\nP. Afr. persistens poses a health risk because it can lead to serious consequences such as cardiac arrest, arrhythmia, damage to the heart valves or the formation of pulmonary hypertension.\n\nD. Afr..pert. should not be confused with an extrasystolic rhythm, especially if it cannot be attributed to any parasystole, and its frequency exceeds 25 per minute.\n\nInadequate precursor of arrhythmia. with bigeminy (V = 3Q/1Q), may be associated with a sudden illness known as lycoformis